JP7262525B2 - Chute unit and boiler plant - Google Patents

Description

The present disclosure relates to chute units and boiler plants.

Patent Literature 1 discloses a chute protection device for protecting the chute of a fluidized bed boiler from impact when a fluidized medium falls. This chute protection device has an upstream drop pipe for guiding downward a fluidized medium dropped from above the chute, and a floor onto which the fluidized medium discharged from the upstream drop pipe drops. and a downstream drop for guiding the fluidized medium falling from the impact reduction section to the inside of the chute located below the impact reduction section. a tube;

According to this configuration, the fluidized medium is allowed to drop to the shock reduction section before dropping to the chute section, so that the impact generated in the chute section can be reduced as compared with the case where the fluid medium is dropped directly to the chute section. can protect the chute.

Japanese Patent Application Laid-Open No. 2020-101308

The configuration described in Patent Document 1 has room for improvement in terms of suppressing abrasion of the floor surface of the chute portion (inclined flow passage portion).

In view of the circumstances described above, an object of at least one embodiment of the present disclosure is to provide a chute unit and a boiler plant including the chute unit that can suppress wear of the floor surface of the inclined flow passage.

In order to achieve the above object, a chute unit according to at least one embodiment of the present disclosure comprises:
A chute unit for flowing a medium, comprising:
an inclined channel portion having a floor inclined with respect to the horizontal direction;
a plurality of weir members provided on the inner surface of the inclined flow path;
with
In a cross section including the axis and the vertical line of the inclined flow passage, the angle formed by the floor surface and the virtual line connecting the upper end and the lower end of the weir member on the downstream side of the virtual line in the flow direction of the medium is , greater than the angle of inclination between the horizontal line and the floor surface.

In order to achieve the above object, a boiler plant according to at least one embodiment of the present disclosure includes
It comprises a fluidized bed boiler and the chute unit.

According to at least one embodiment of the present disclosure, a chute unit capable of suppressing abrasion of a floor surface of an inclined flow passage and a boiler plant including the chute unit are provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows typically schematic structure of the boiler plant 2 which concerns on one Embodiment. 1 is a front view of chute unit 12 according to one embodiment. FIG. FIG. 3 is a rear view of the chute unit 12 shown in FIG. 2; Fig. 3 is a plan view of the chute unit 12 shown in Fig. 2; Fig. 3 is a right side view of the chute unit 12 shown in Fig. 2; FIG. 3 is a bottom view of the chute unit 12 shown in FIG. 2; FIG. 3 is a cross-sectional view of the chute unit 12 shown in FIG. 2 taken along the line AA. FIG. 8 is a cross-sectional view along the line BB of the chute unit 12 shown in FIG. 7; FIG. 8 is a view of the chute unit 12 shown in FIG. 7 in a state where a lid member 35 is removed from the inspection opening 31 as viewed in direction C; FIG. 8 is a partially enlarged cross-sectional view enlarging a part of the AA cross section shown in FIG. 7, showing a part of the cross section including the axis line and the vertical line of the inclined flow path portion 16. FIG. FIG. 8 is a partially enlarged cross-sectional view enlarging a part of the AA cross section shown in FIG. 7, showing a part of the cross section including the axis line and the vertical line of the inclined flow path section 16 (the same part as in FIG. 10); ing. FIG. 3 is a diagram for explaining a case where an intersection point P1 between a vertical virtual line L3 and a horizontal virtual line L4 is located outside the inclined flow path portion 16 (outside the flow path of the inclined flow path portion 16). FIG. 8 is a partially enlarged cross-sectional view enlarging a part of the AA cross section shown in FIG. 7, showing a part of the cross section including the axis line and the vertical line of the inclined flow path portion 16. FIG. It is a sectional view showing a modification of chute unit 12, and shows a part of section containing an axis of inclined channel part 16, and a perpendicular line. It is a sectional view showing a modification of chute unit 12, and shows a part of section containing an axis of inclined channel part 16, and a perpendicular line. It is a sectional view showing a modification of chute unit 12, and shows a part of section containing an axis of inclined channel part 16, and a perpendicular line.

Several embodiments of the present disclosure will now be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the invention, but are merely illustrative examples. .
For example, expressions denoting relative or absolute arrangements such as "in a direction", "along a direction", "parallel", "perpendicular", "center", "concentric" or "coaxial" are strictly not only represents such an arrangement, but also represents a state of relative displacement with a tolerance or an angle or distance to the extent that the same function can be obtained.
For example, expressions such as "identical", "equal", and "homogeneous", which express that things are in the same state, not only express the state of being strictly equal, but also have tolerances or differences to the extent that the same function can be obtained. It shall also represent the existing state.
For example, expressions that express shapes such as squares and cylinders do not only represent shapes such as squares and cylinders in a geometrically strict sense, but also include irregularities and chamfers to the extent that the same effect can be obtained. The shape including the part etc. shall also be represented.
On the other hand, the expressions "comprising", "comprising", "having", "including", or "having" one component are not exclusive expressions excluding the presence of other components.

Drawing 1 is a figure showing typically a schematic structure of boiler plant 2 concerning one embodiment.
Boiler plant 2 shown in FIG. and a fluid medium storage tank 10 for storing the fluid medium.

In the fluidized bed boiler 4, a fluidized bed is formed inside the furnace 4a of the fluidized bed boiler 4 in which a fluidized medium is fluidized by air supplied from an air inlet (not shown) into the furnace 4a. In this device, fuel is put in and burned, and the thermal energy of the combustion gas generated by the combustion is recovered by a heat transfer tube (not shown) installed in the rear stage of the furnace 4a and used for power generation and the like.

The fuel line 6 uses bituminous coal, lignite, anthracite, petroleum coke, woody biomass, papermaking sludge, RPF (Refuse Paper & Plastic Fuel), waste tires, etc., or fuels processed from these as fuels for combustion in the boiler. to the fluidized bed boiler 4.

The fluidized medium line 8 includes a fluidized medium extraction line 8a for extracting the fluidized medium from the bottom of the furnace 4a and sending it to the fluidized medium storage tank 10, and a fluidized medium extraction line 8a for sending the fluidized medium from the fluidized medium storage tank 10 to the furnace 4a. and a re-input line 8b.

The fluid medium sent from the fluid medium extraction line 8 a to the fluid medium storage tank 10 is stored in the fluid medium storage tank 10 . The fluidized medium sent to the furnace 4a from the fluidized medium re-injection line 8b is reintroduced into the furnace 4a from the fluidized medium re-injection line 8b.

Thus, the fluidized medium line 8 is configured to circulate at least part of the fluidized medium in the furnace 4a to and from the fluidized medium storage tank 10 .

Next, the chute unit 12 applicable to each of the fluid medium extraction line 8a and the fluid medium re-input line 8b in the fluid medium line 8 shown in FIG. 1 will be described.

FIG. 2 is a front view of chute unit 12 according to one embodiment. FIG. 3 is a rear view of chute unit 12 shown in FIG. FIG. 4 is a plan view of chute unit 12 shown in FIG. FIG. 5 is a right side view of chute unit 12 shown in FIG. FIG. 6 is a bottom view of chute unit 12 shown in FIG. FIG. 7 is a cross-sectional view of the chute unit 12 shown in FIG. 2 taken along the line AA. FIG. 8 is a BB cross-sectional view of the chute unit 12 shown in FIG.

For example, as shown in FIGS. 2-7, the chute unit 12 includes a vertical channel portion 14 and an inclined channel portion 16 . The AA cross section shown in FIG. connecting straight line) and a vertical line (the axis Lb of the vertical flow path portion 14). The axis La of the inclined flow passage portion 16 is a straight line that connects the center of the cross section that defines the cross-sectional area of the inclined flow passage portion 16 in the direction in which the inclined flow passage portion 16 extends. It is a straight line along the direction of extension. The axis Lb of the vertical flow path portion 14 is a straight line that connects the center of the cross section that defines the cross-sectional area of the vertical flow path portion 14 in the direction in which the vertical flow path portion 14 extends. It is a straight line extending vertically.

The vertical channel portion 14 is configured in a tubular shape having a rectangular cross section. That is, the cross section of the vertical flow path section 14 perpendicular to the vertical direction has a rectangular shape. For example, as shown in FIG. 7, the vertical channel portion 14 is connected to the upper end of the inclined channel portion 16 and extends upward in the vertical direction from the upper end of the inclined channel portion 16. . An opening 18 through which the fluid medium passes is formed at the upper end of the vertical channel portion 14 , and a flange 20 is formed around the opening 18 .

The inclined channel portion 16 is configured in a tubular shape having a rectangular cross section. That is, the channel cross section of the inclined channel portion 16 perpendicular to the axis La of the inclined channel portion 16 has a rectangular shape. The inclined channel portion 16 is connected to the lower end of the vertical channel portion 14, and is inclined downward from the lower end of the vertical channel portion 14 with respect to the horizontal direction along the inclined direction d1 (the direction along the axis La). extended. An opening 22 through which the fluid medium passes is formed at the downstream end of the inclined channel portion 16 in the direction of flow of the fluid medium, and a flange 24 is formed around the opening 22 . Hereinafter, the flow direction of the fluid medium along the inclination direction d1 is referred to as the flow direction d1 of the fluid medium.

For example, as shown in FIG. 7 or FIG. 8, the inner surface 26 of the inclined flow passage portion 16 includes a floor surface 28 inclined with respect to the horizontal direction, a ceiling surface 30 facing the floor surface 28, and a ceiling surface 30 facing the floor surface 28 and the ceiling surface. 30 and a pair of opposed side surfaces 32,34.

For example, as shown in FIG. 7, the floor surface 28 of the inclined channel portion 16 is provided with a plurality of dam members 36 (nine dam members 36 in the illustrated example). The plurality of dam members 36 are arranged at intervals in the axial direction of the inclined flow passage portion 16 (the direction in which the inclined flow passage portion 16 extends, that is, the above-described inclination direction d1). Each of the dam members 36 is provided so as to protrude from the floor surface 28 of the inclined flow path portion 16 toward the ceiling surface 30 side. Each of the dam members 36 is formed in a plate shape along a plane intersecting the tilt direction d1 (a plane perpendicular to the tilt direction d1 in the illustrated example).

An inspection opening 31 penetrating through the ceiling surface 30 is formed in the ceiling surface 30 of the inclined flow passage portion 16 , and a lid member 35 is attached to the outside of the inclined flow passage portion 16 to close the inspection opening 31 . A handle 35 a is provided on the outer side of the lid member 35 for use in opening and closing the lid member 35 .

For example, as shown in FIG. 8, in each of the weir members 36, one end of the weir member 36 in the horizontal direction orthogonal to the inclination direction d1 is connected to the side surface 32, and the weir member 36 in the horizontal direction orthogonal to the inclination direction d1 is connected to the side surface 32. is connected to side 34 .

FIG. 9 is a view of the chute unit 12 in the direction C of the configuration shown in FIG. 7 with the lid member 35 removed from the inspection opening 31. As shown in FIG. As shown in FIG. 9 , by removing the cover member 35 from the inspection opening 31 , the state of the interior including the floor surface 28 of the inclined flow path section 16 can be checked through the inspection opening 31 .

FIG. 10 is a partially enlarged sectional view enlarging a part of the AA section shown in FIG. In FIG. 10 , the fluidized medium deposited by being dammed by the dam member 36 is schematically shown by dot hatching.

For example, as shown in FIG. 10, for each of the weir members 36 in the AA cross section, the upper end 36a of the weir member 36 (the tip of the weir member 36) and the lower end 36b of the weir member 36 (the floor surface 28 of the weir member 36) The angle formed by the floor surface 28 and the virtual line L1 (the virtual line along the direction in which the weir member 36 protrudes) connecting the base end that is the side end) and the floor surface 28 on the downstream side of the virtual line L1 in the flow direction d1 of the fluidized medium β is greater than the inclination angle α between the horizontal line L2 and the floor surface 28 .

As a result, as shown in FIG. 10, the fluid medium can be dammed by the dam member 36 and deposited and held between the dam member 36 and the floor surface 28 . For this reason, the fluid medium flowing through the inclined channel portion 16 flows over the deposited fluid medium, and the moving fluid medium having kinetic energy and the floor surface 28 of the inclined channel portion 16 are prevented from coming into contact with each other. This can be suppressed or avoided, and wear of the floor surface 28 of the inclined channel portion 16 can be suppressed.

FIG. 11 is a partially enlarged cross-sectional view showing a part of the AA cross section shown in FIG. In FIG. 11 , the fluidized medium deposited by being dammed by the dam member 36 is schematically shown by dot hatching.

For example, as shown in FIG. 11, in the AA cross section, a vertical direction imaginary drawn in the vertical direction from an upper end 36a of a dam member 36A located on the upstream side among two adjacent dam members 36 among the plurality of dam members 36 An intersection point P1 between the line L3 and a horizontal imaginary line L4 drawn in the horizontal direction from the upper end 36a of the weir member 36B located downstream of the two adjacent weir members 36 is the inner side (the inclined (within the channel of the channel portion 16).

Here, the effects of the configuration described with reference to FIG. 11 will be described in comparison with the configuration shown in FIG. 12 .

As shown in FIG. 12, if the intersection point P1 between the vertical virtual line L3 and the horizontal virtual line L4 is positioned outside the inclined channel portion 16 (outside the channel of the inclined channel portion 16), the adjacent Of the two weir members 36 that meet, the fluid medium that has fallen over the upstream weir member 36A has a flow direction greater than that of the fluid medium accumulated between the downstream weir member 36B and the floor surface 28. On the upstream side of d1, there is a possibility of colliding with the range W1 on the floor surface 28 where the fluid medium is not deposited.

On the other hand, according to the configuration shown in FIG. It will fall on the fluid medium deposited in between. Therefore, it is possible to effectively suppress or avoid contact between the moving fluid medium having kinetic energy and the floor surface 28 of the inclined flow passage portion 16 , thereby reducing wear of the floor surface 28 of the inclined flow passage portion 16 . can enhance the effect of suppressing

For example, as shown in FIG. 4 , when the chute unit 12 is viewed from above along the axial direction of the vertical channel portion 14 , the plurality of weir members 36 are positioned inside the vertical channel portion 14 . It includes two weir members 36 . In the illustrated example, when the chute unit 12 is viewed from above along the axial direction of the vertical channel portion 14, the plurality of dam members 36 are the eight dam members 36 positioned inside the vertical channel portion 14. including.

According to this configuration, the fluid medium can be deposited directly below the vertical flow path section 14 by the dam member 36 positioned inside the vertical flow path section 14 , so that the flow that has dropped inside the vertical flow path section 14 can be prevented. It is possible to prevent the medium from colliding with the floor surface 28 in the portion of the inclined flow path portion 16 located immediately below the vertical flow path portion 14, and to prevent wear of the floor surface 28.

For example, as shown in FIG. 13, an upper end 36a of a dam member 36U, which is positioned most upstream in the flow direction d1 of the fluid medium among the plurality of dam members 36 in the AA cross section, is located vertically between the floor surface 28 and the vertical flow path. It is located higher than the position P2 where the inner surface 40 of the portion 14 is connected.

As a result, in the AA cross section, the space Q surrounded by the weir member 36U located on the most upstream side, the floor surface 28 of the inclined flow path portion 16, and the inner surface 40 of the vertical flow path portion 14 has an inclined flow path portion. The fluid medium can be deposited to a position higher than the position P2, which is the upper end of the floor surface 28 of the . As a result, the fluidized medium falling along the inner surface 40 of the vertical flow path portion 14 can be received by the accumulated fluidized medium, and the fluidized medium falling along the inner surface 40 of the vertical flow path portion 14 can be received by the inclined flow path portion 16 . direct collision with the floor surface 28 can be suppressed or avoided. Therefore, it is possible to suppress the wear of the portion of the floor surface 28 of the inclined channel portion 16 that is likely to wear.

For example, as shown in FIG. 13, in the AA cross section, the intersection of the floor surface 28 and the vertical line L5 passing through the position P3 where the ceiling surface 30 and the inner surface 42 of the vertical flow path portion 14 connect is the downstream intersection point P4. , the plurality of dam members 36 include a dam member 36D having an upper end 36a at a position downstream and higher than the downstream intersection P4 in the flow direction d1 of the fluid medium. In the illustrated example, the dam member 36 positioned most downstream in the flow direction d1 of the fluid medium among the plurality of dam members 36 corresponds to the dam member 36D.

As a result, the fluidized medium can be deposited by the weir member 36D at the falling position of the fluidized medium falling along the inner surface 42 connected to the ceiling surface 30 in the AA cross section. Therefore, the fluidized medium falling along the inner surface 42 connected to the ceiling surface 30 can be received by the deposited fluidized medium, and the fluidized medium falling along the inner surface 42 of the vertical flow path portion 14 can be received by the inclined flow path portion. A direct collision with the floor surface 28 of 16 can be suppressed or avoided. Further, according to the configuration shown in FIG. 13 , the fluidized medium can be deposited over the entire range of the floor surface 28 of the inclined channel portion 16 that is directly below the vertical channel portion 14 . It is possible to effectively suppress or avoid direct collision of the fluid medium falling down the channel portion 14 with the floor surface 28 of the inclined channel portion 16 . Therefore, it is possible to suppress the wear of the portion of the floor surface 28 of the inclined channel portion 16 that is likely to wear.

For example, as shown in FIG. 13 , a reinforcing plate 46 is provided over the entire area of the bottom surface 44 of the inclined flow path section 16 located immediately below the vertical flow path section 14 (the range of the bottom surface 44 above the vertical line L5). Fixed. As a result, deformation of the floor surface 28 of the inclined flow passage portion 16 can be suppressed, and leakage of the fluidized medium can be prevented by the reinforcing plate 46 even if the wear of the floor surface 28 of the inclined flow passage portion 16 progresses.

FIG. 14 is a cross-sectional view showing a modification of the chute unit 12. As shown in FIG.
In some embodiments, the floor 28 of the angled channel section 16 has a recess 50 beneath the vertical channel section 14, for example as shown in FIG. In the illustrated example, a box-shaped structural portion 52 that opens upward is provided directly below the vertical channel portion 14 , and the inner surface of the box-shaped structural portion 52 corresponds to the recess 50 . Also, in the illustrated example, the plurality of dam members 36 are provided downstream of the recess 50 in the flow direction of the fluid medium.

According to such a configuration, the fluid medium falling inside the vertical flow path portion 14 can be deposited in the concave portion 50 . As a result, the fluidized medium deposited in the concave portion 50 can receive the fluidized medium falling along the inner surface of the vertical flow path portion 14 , and the fluidized medium falling inside the vertical flow path portion 14 can be received by the inclined flow path portion 16 . A direct collision with the floor surface 28 can be suppressed or avoided. Therefore, it is possible to suppress the wear of the portion of the floor surface 28 of the inclined channel portion 16 that is likely to wear. Further, for example, when the inclined flow passage portion 16 has a circular flow passage cross section, it is likely to be difficult to join the dam member 36 to the floor surface 28 of the inclined flow passage portion 16 by welding or the like. The concave portion 50 can be provided regardless of the cross-sectional shape of the inclined channel portion 16 .

Further, for example, when the range in which the concave portion 50 can be formed is limited due to layout restrictions, a plurality of dam members 36 may be provided downstream of the concave portion 50 in the flow direction of the fluid medium to deposit the fluid medium. As a result, wear due to collision with the fluid medium can be suppressed over a wide area on the floor surface 28 of the inclined channel portion 16 . In addition, compared with the case where the flat portion 54 is provided as in the embodiment shown in FIG. be able to.

The present disclosure is not limited to the above-described embodiments, and includes modifications of the above-described embodiments and modes in which these modes are combined as appropriate.

For example, the chute unit 12 according to some of the embodiments described above may be applied not only to the fluid medium line 8 but also to the fuel line 6 shown in FIG. 1, for example. In this case, when the fuel supplied to the fluidized bed boiler 4 through the fuel line 6 contains a fluidized medium such as pellets or chips such as woody biomass or waste biomass, the floor of the inclined flow passage portion 16 in the fuel line 6 Wear of the surface 28 can be suppressed.

Further, the chute unit 12 described above includes the vertical channel portion 14 and the inclined channel portion 16, but the chute unit may not include the vertical channel portion, and the upper end of the inclined channel portion 16 may be formed with an opening serving as an inlet for the fluid medium.

Further, the cross section perpendicular to the vertical direction in the vertical channel portion 14 is not limited to a rectangular shape, and may be a circular shape. Moreover, the cross section of the inclined flow path portion 16 perpendicular to the inclination direction d1 is not limited to a rectangular shape, and may be a circular shape. In this case, the “floor surface” of the inclined channel portion is a surface of the inner surface of the inclined channel portion that corresponds to the lower semicircle in the circular shape, and is perpendicular to the axis of the inclined channel portion and the axis. the plane below the plane containing the horizontal line

Further, as shown in FIG. 15, for example, in the AA cross section described above, the angle α formed between the floor surface 28 and the horizontal line L2 and the angle β formed between the imaginary line L1 and the floor surface 28 are α<β< 90° may be satisfied.

As a result, the fluidized medium on the floor surface 28 can be effectively deposited with a small number of dam members 36, and wear of the floor surface 28 of the inclined flow passage portion 16 can be suppressed with a simple configuration.

Further, as shown in FIG. 16 for example, the floor surface 28 of the inclined channel portion 16 has a plane portion 54 perpendicular to the vertical direction immediately below the vertical channel portion 14 . In the illustrated example, the plurality of dam members 36 are provided downstream of the flat portion 54 in the flow direction of the fluid medium.

According to such a configuration, the fluid medium falling inside the vertical flow path portion 14 can be deposited on the flat portion 54 . As a result, the fluidized medium deposited on the flat portion 54 can receive the fluidized medium falling along the inner surface of the vertical flow path portion 14 , and the fluidized medium falling inside the vertical flow path portion 14 can be received by the inclined flow path portion 16 . direct collision with the floor surface 28 can be suppressed or avoided. Therefore, it is possible to suppress the wear of the portion of the floor surface 28 of the inclined channel portion 16 that is likely to wear. Further, for example, when the inclined flow passage portion 16 has a circular flow passage cross section, it is likely to be difficult to join the dam member 36 to the floor surface 28 of the inclined flow passage portion 16 by welding or the like. The plane portion 54 can be provided regardless of the cross-sectional shape of the inclined channel portion 16 .

In addition, for example, when the range in which the flat portion 54 can be formed is limited due to layout restrictions, a plurality of weir members 36 are provided downstream of the flat portion 54 in the flow direction of the fluid medium to allow the fluid medium to accumulate. As a result, abrasion due to collision with the fluid medium can be suppressed over a wide area on the floor surface 28 of the inclined channel portion 16 .

The contents described in each of the above embodiments are understood as follows, for example.

(1) A chute unit according to at least one embodiment of the present disclosure,
A chute unit for conveying a fluidizing medium for a fluidized bed boiler, comprising:
an inclined channel portion having a floor inclined with respect to the horizontal direction;
a plurality of weir members provided on the inner surface of the inclined flow path;
with
In the cross section including the axis line and the vertical line of the inclined flow passage portion, the angle formed between the imaginary line connecting the upper end and the lower end of the weir member and the floor surface is larger than the inclination angle formed between the horizontal line and the floor surface. big.

According to the chute unit described in (1) above, in a cross section including the axis line of the inclined channel portion and the vertical line, the angle formed by the imaginary line connecting the upper end and the lower end of the weir member and the floor surface is equal to the floor surface. , the fluid medium can be dammed by the dam member, and the fluid medium can be deposited and held between the dam member and the floor surface. For this reason, the fluid medium flowing through the inclined flow path portion flows over the deposited fluid medium, thereby suppressing or avoiding contact between the moving fluid medium having kinetic energy and the floor surface of the inclined flow path portion. It is possible to suppress the wear of the floor surface of the inclined channel portion.

(2) In some embodiments, in the chute unit described in (1) above,
In the cross section, a vertical imaginary line drawn in the vertical direction from an upper end of a weir member located on the upstream side of two adjacent weir members among the plurality of weir members, and a downstream side of the two adjacent weir members. A point of intersection with a horizontal imaginary line drawn in the horizontal direction from the upper end of the weir member located at is located inside the inclined channel portion.

If the intersection of the vertical imaginary line and the horizontal imaginary line is located outside the inclined channel portion, the fluidized medium that has fallen over the upstream weir member of the two adjacent weir members will flow downstream. There is a possibility that the fluidized medium will collide with a range on the floor surface where the fluidized medium is not deposited on the upstream side of the fluidized medium deposited between the weir member on the side and the floor surface.
On the other hand, according to the chute unit described in (2) above, the fluid medium that has fallen over the upstream weir member of the two adjacent weir members falls between the downstream weir member and the floor surface. will fall on the fluid medium deposited on the For this reason, it is possible to effectively suppress or avoid contact between the moving fluid medium having kinetic energy and the floor surface of the inclined flow passage, thereby suppressing wear of the floor surface of the inclined flow passage. can increase

(3) In some embodiments, in the chute unit according to (1) or (2) above,
further comprising a vertical channel portion extending vertically from an upper end of the inclined channel portion;
The plurality of weir members includes at least one weir member positioned inside the vertical passage portion when the chute unit is viewed from above along the axial direction of the vertical passage portion.

According to the chute unit described in (3) above, since the at least one weir member allows the fluidized medium to accumulate directly below the vertical flow path, the fluidized medium falling inside the vertical flow path can be deposited. It is possible to suppress the portion of the inclined flow path portion located directly below the vertical flow path portion from colliding with the floor surface, thereby suppressing wear of the floor surface.

(4) In some embodiments, in the chute unit described in (3) above,
In the cross section, the upper end of the weir member positioned most upstream in the direction of flow of the fluid medium among the plurality of weir members is higher than the position where the floor surface and the inner surface of the vertical channel portion are connected. It is in.

According to the chute unit described in (4) above, the floor of the inclined channel portion is placed in the space surrounded by the weir member positioned most upstream, the floor surface of the inclined channel portion, and the inner surface of the vertical channel portion. The flowing medium can be deposited to a position higher than the top of the surface. As a result, the fluidized medium falling along the inner surface of the vertical flow path can be received by the accumulated fluidized medium, and the fluidized medium falling along the inner surface of the vertical flow path directly hits the floor surface of the inclined flow path. Collision can be suppressed or avoided. Therefore, it is possible to suppress the abrasion of the portion of the floor surface of the inclined flow passage that is likely to be worn.

(5) In some embodiments, in the chute unit according to (3) or (4) above,
The inclined channel portion includes a ceiling surface facing the floor surface,
In the cross section, when the intersection of the vertical line passing through the position where the ceiling surface and the inner surface of the vertical flow path connect and the floor surface is defined as the downstream intersection point,
The plurality of dam members include dam members having upper ends on the downstream side of the downstream intersection and above the downstream intersection in the flow direction of the fluid medium.

According to the chute unit described in (5) above, in the cross section, the dam member can deposit the fluidized medium at the falling position of the fluidized medium falling along the inner surface connected to the ceiling surface. For this reason, the fluidized medium falling along the inner surface connected to the ceiling surface can be received by the accumulated fluidized medium, and the fluidized medium falling along the inner surface connected to the ceiling surface can be received by the floor surface of the inclined flow path portion. It is possible to suppress or avoid direct collision with Therefore, it is possible to suppress the abrasion of the portion of the floor surface of the inclined flow passage that is likely to be worn. In particular, when all of the configurations described in (1) to (5) above are provided, it is possible to prevent the fluidized medium from directly falling on the floor surface of the inclined channel portion in the range directly below the vertical channel portion. Alternatively, the avoidance effect can be further enhanced, and the wear of the portion of the floor surface of the inclined flow passage portion that is likely to wear can be suppressed.

(6) In some embodiments, in the chute unit according to (1) or (2) above,
further comprising a vertical channel portion extending vertically from an upper end of the inclined channel portion;
The floor surface of the inclined channel portion has a flat portion immediately below the vertical channel portion.

According to the chute unit described in (6) above, the fluid medium falling inside the vertical flow path portion can be deposited on the flat portion. As a result, the fluidized medium deposited on the flat surface can receive the fluidized medium falling along the inner surface of the vertical flow path, and the fluidized medium falling inside the vertical flow path can be received by the floor surface of the inclined flow path. Direct collision can be suppressed or avoided. Therefore, it is possible to suppress the abrasion of the portion of the floor surface of the inclined flow passage that is likely to be worn.

(7) In some embodiments, in the chute unit according to (1) or (2) above,
further comprising a vertical channel portion extending vertically from an upper end of the inclined channel portion;
The floor surface of the inclined channel portion has a recess just below the vertical channel portion.

According to the chute unit described in (7) above, the flowing medium falling inside the vertical channel portion can be deposited in the concave portion. As a result, the fluidized medium deposited in the recess can receive the fluidized medium falling along the inner surface of the vertical flow path, and the fluidized medium falling inside the vertical flow path directly hits the floor surface of the inclined flow path. Collision can be suppressed or avoided. Therefore, it is possible to suppress the abrasion of the portion of the floor surface of the inclined flow passage that is likely to be worn. Moreover, compared with the configuration described in (6) above, the fluidized medium can be reliably deposited in the recess, and wear of the floor surface can be effectively suppressed.

(8) In some embodiments, in the chute unit described in (7) above,
The plurality of dam members include at least one dam member provided downstream of the recess in the flow direction of the fluid medium.

According to the chute unit described in (8) above, it is possible to suppress abrasion of the floor surface immediately below the vertical flow path portion by the fluidized medium accumulated in the concave portion of (7) above. Further, even when the range in which the recesses can be formed is limited due to layout restrictions, a weir member may be provided downstream of the recesses in the flow direction of the fluid medium as described in (8) above. By accumulating the medium, it is possible to suppress abrasion caused by collision with the flowing medium over a wide area on the floor surface of the inclined channel portion.

(9) A boiler plant according to at least one embodiment of the present disclosure,
A fluidized bed boiler and a chute unit according to any one of (1) to (8) above.

According to the boiler plant described in (9) above, since the chute unit described in any one of (1) to (8) is provided, it is possible to suppress abrasion of the floor surface of the inclined flow passage portion. As a result, it is possible to reduce the shutdown of the boiler plant, maintenance, etc. due to damage to the floor surface of the inclined flow passage portion.

2 Boiler Plant 4 Fluidized Bed Boiler 4a Furnace 6 Fuel Line 8 Fluidized Medium Line 8a Fluidized Medium Extraction Line 8b Re-Injection Line 10 Fluidized Medium Storage Tank 12 Chute Unit 14 Vertical Channel Section 16 Inclined Channel Sections 18, 22 Opening 20, 24 Flanges 26, 40, 42 Inner surface 28 Floor surface 30 Ceiling surface 31 Inspection openings 32, 34 Side surface 35 Lid member 35a Handles 36, 36A, 36B, 36D, 36U Weir member 36a Upper end 36b Lower end 44 Bottom surface 46 Reinforcing plate 50 Recess 52 Structure Department

Claims (5)

A chute unit for conveying media,
an inclined channel portion having a floor inclined with respect to the horizontal direction;
a plurality of weir members provided on the inner surface of the inclined flow path;
with
Each of the plurality of weir members is joined to the floor surface,
In a cross section including the axis and the vertical line of the inclined flow passage, the angle formed by the floor surface and the virtual line connecting the upper end and the lower end of the weir member on the downstream side of the virtual line in the flow direction of the medium is , greater than the angle of inclination between the horizontal line and the floor surface,
In the cross section, a vertical imaginary line drawn in the vertical direction from an upper end of a weir member located on the upstream side of two adjacent weir members among the plurality of weir members, and a downstream side of the two adjacent weir members. The intersection with the horizontal imaginary line drawn in the horizontal direction from the upper end of the weir member located at is located inside the inclined flow path portion,
further comprising a vertical channel portion extending vertically from an upper end of the inclined channel portion;
When the chute unit is viewed from above along the axial direction of the vertical channel portion, the plurality of weir members includes at least one weir member positioned inside the vertical channel portion,
In the cross section, the upper end of the weir member positioned most upstream in the direction of flow of the medium among the plurality of weir members is positioned higher than the position where the floor surface and the inner surface of the vertical flow path are connected. be,
shoot unit. The inclined channel portion includes a ceiling surface facing the floor surface,
In the cross section, when the intersection of the vertical line passing through the position where the ceiling surface and the inner surface of the vertical flow path connect and the floor surface is defined as the downstream intersection point,
2. The chute unit according to claim 1 , wherein said plurality of weir members includes a weir member having an upper end downstream of said downstream intersection and above said downstream intersection in the flow direction of said medium. A chute unit for conveying media,
an inclined channel portion having a floor inclined with respect to the horizontal direction;
a plurality of weir members provided on the inner surface of the inclined flow path;
with
Each of the plurality of weir members is joined to the floor surface,
In a cross section including the axis and the vertical line of the inclined flow passage, the angle formed by the floor surface and the virtual line connecting the upper end and the lower end of the weir member on the downstream side of the virtual line in the flow direction of the medium is , greater than the angle of inclination between the horizontal line and the floor surface,
In the cross section, a vertical imaginary line drawn in the vertical direction from an upper end of a weir member located on the upstream side of two adjacent weir members among the plurality of weir members, and a downstream side of the two adjacent weir members. is located inside the inclined channel portion, and
further comprising a vertical channel portion extending vertically from an upper end of the inclined channel portion;
The floor surface of the inclined channel portion has a flat portion immediately below the vertical channel portion ,
In the cross section, an upper end of the dam member positioned most upstream in the flow direction of the medium among the plurality of dam members is positioned higher than the flat portion.
shoot unit. 4. The chute unit according to claim 3 , wherein said plurality of weir members includes at least one weir member provided downstream of said planar portion in the flow direction of said medium. A boiler plant comprising a fluidized bed boiler and the chute unit according to any one of claims 1 to 4 .

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